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Ultrafast THz Probe of Photoinduced Polarons in Lead-Halide Perovskites

Cinquanta, Eugenio; Meggiolaro, Daniele; Motti, Silvia G.; Gandini, Marina; Alcocer, Marcelo J.P. LU ; Akkerman, Quinten A.; Vozzi, Caterina; Manna, Liberato; De Angelis, Filippo and Petrozza, Annamaria, et al. (2019) In Physical Review Letters 122(16).
Abstract

We study the nature of photoexcited charge carriers in CsPbBr3 nanocrystal thin films by ultrafast optical pump-THz probe spectroscopy. We observe a deviation from a pure Drude dispersion of the THz dielectric response that is ascribed to the polaronic nature of carriers; a transient blueshift of observed phonon frequencies is indicative of the coupling between photogenerated charges and stretching-bending modes of the deformed inorganic sublattice, as confirmed by DFT calculations.

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publication status
published
subject
in
Physical Review Letters
volume
122
issue
16
publisher
American Physical Society
external identifiers
  • scopus:85065149531
ISSN
0031-9007
DOI
10.1103/PhysRevLett.122.166601
language
English
LU publication?
yes
id
48b11626-6eaf-4087-9f23-fe3f6f4bb696
date added to LUP
2019-05-15 14:53:48
date last changed
2019-05-15 14:53:48
@article{48b11626-6eaf-4087-9f23-fe3f6f4bb696,
  abstract     = {<p>We study the nature of photoexcited charge carriers in CsPbBr3 nanocrystal thin films by ultrafast optical pump-THz probe spectroscopy. We observe a deviation from a pure Drude dispersion of the THz dielectric response that is ascribed to the polaronic nature of carriers; a transient blueshift of observed phonon frequencies is indicative of the coupling between photogenerated charges and stretching-bending modes of the deformed inorganic sublattice, as confirmed by DFT calculations.</p>},
  articleno    = {166601},
  author       = {Cinquanta, Eugenio and Meggiolaro, Daniele and Motti, Silvia G. and Gandini, Marina and Alcocer, Marcelo J.P. and Akkerman, Quinten A. and Vozzi, Caterina and Manna, Liberato and De Angelis, Filippo and Petrozza, Annamaria and Stagira, Salvatore},
  issn         = {0031-9007},
  language     = {eng},
  number       = {16},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Ultrafast THz Probe of Photoinduced Polarons in Lead-Halide Perovskites},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.122.166601},
  volume       = {122},
  year         = {2019},
}